Re: [PATCH v3] app/testpmd: fix incorrect queues state of secondary process

["lihuisong (C)" <lihuisong@huawei.com>]

在 2022/9/10 17:21, Zhang, Peng1X 写道:
>
>> -----Original Message-----
>> From: lihuisong (C) <lihuisong@huawei.com>
>> Sent: Wednesday, September 7, 2022 9:53 AM
>> To: Zhang, Peng1X <peng1x.zhang@intel.com>; dev@dpdk.org
>> Cc: andrew.rybchenko@oktetlabs.ru; Singh, Aman Deep
>> <aman.deep.singh@intel.com>; Zhang, Yuying <yuying.zhang@intel.com>;
>> stable@dpdk.org
>> Subject: Re: [PATCH v3] app/testpmd: fix incorrect queues state of secondary
>> process
>>
>>
>> 在 2022/9/6 22:53, Peng Zhang 写道:
>>> Primary process could set up queues state correctly when starting
>>> port, while secondary process not. Under multi-process scenario,
>> "stream_init"
>>> function would get wrong queues state for secondary process.
>>>
>>> This commit is to get queues state from ethdev which is located in
>>> shared memory.
>>>
>>> Fixes: 3c4426db54fc ("app/testpmd: do not poll stopped queues")
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Peng Zhang <peng1x.zhang@intel.com>
>>>
>>> ---
>>>    v3:
>>>    - Modify the parameter of rx or tx queue state array
>>>    v2:
>>>    - Change the way of getting secondary process queues states
>>> ---
>>>    app/test-pmd/testpmd.c | 22 +++++++++++++++++++---
>>>    1 file changed, 19 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
>>> addcbcac85..977ec4fa28 100644
>>> --- a/app/test-pmd/testpmd.c
>>> +++ b/app/test-pmd/testpmd.c
>>> @@ -75,6 +75,8 @@
>>>
>>>    #include "testpmd.h"
>>>
>>> +#include <ethdev_driver.h>
>> This header file is internal, app shouldn't use it.
> In this case not all PMDs implement 'rte_eth_rx/tx_queue_info_get()' and ethdev won't return 'dev->data->rx/tx_queue_state'.
I don't think Rx/Tx queue state needs to be put in the API above.
The queue state is modified by calling 'rte_eth_dev_rx/tx_queue_stop/start'.
Can we create a new API to report queue state? like, 
'rte_eth_dev_rx/tx_queue_state_get'.
If some PMDs do not support 'rte_eth_dev_rx/tx_queue_stop/start', the new
API always return 'START' state and preserves its original behavior.

What do you think?
>
>>> +
>>>    #ifndef MAP_HUGETLB
>>>    /* FreeBSD may not have MAP_HUGETLB (in fact, it probably doesn't) */
>>>    #define HUGE_FLAG (0x40000)
>>> @@ -2402,10 +2404,24 @@ start_packet_forwarding(int with_tx_first)
>>>    	if (!pkt_fwd_shared_rxq_check())
>>>    		return;
>>>
>>> -	if (stream_init != NULL)
>>> -		for (i = 0; i < cur_fwd_config.nb_fwd_streams; i++)
>>> -			stream_init(fwd_streams[i]);
>>> +	if (stream_init != NULL) {
>>> +		for (i = 0; i < cur_fwd_config.nb_fwd_streams; i++) {
>>> +			if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
>>> +				struct fwd_stream *fs = fwd_streams[i];
>>> +				struct rte_eth_dev_data *dev_rx_data,
>> *dev_tx_data;
>>> +
>>> +				dev_rx_data = (&rte_eth_devices[fs->rx_port])-
>>> data;
>>> +				dev_tx_data = (&rte_eth_devices[fs->tx_port])-
>>> data;
>>> +
>>> +				uint8_t rx_state = dev_rx_data-
>>> rx_queue_state[fs->rx_queue];
>>> +				ports[fs->rx_port].rxq[fs->rx_queue].state =
>> rx_state;
>>> +				uint8_t tx_state = dev_tx_data-
>>> tx_queue_state[fs->tx_queue];
>>> +				ports[fs->tx_port].txq[fs->tx_queue].state =
>> tx_state;
>>> +			}
>>>
>>> +			stream_init(fwd_streams[i]);
>>> +		}
>>> +	}
>>>
>> Suggest that an API in ethdev layer can be encapsulated to obtain the device
>> Rx/Tx queue state.
>> Both primary and secondary process get or set queue state by this API.
> Suggestion sounds good, maybe better to add a new API in ethdev layer.
>
> @andrew, what's your opinion about this solution and huisong's suggestion?
>
>>>    	port_fwd_begin = cur_fwd_config.fwd_eng->port_fwd_begin;
>>>    	if (port_fwd_begin != NULL) {
>>>    		for (i = 0; i < cur_fwd_config.nb_fwd_ports; i++) {